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Originally Posted by Strife
You're right, LED's can't be "dimmed" in the conventional sense, but they could be modulated with a duty cycle ranging from 5% to 100% at a fairly high frequency, giving the illusion of dimming.
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This is not correct. LED luminance is proportional to the dc drive current. You can adjust smoothly from 'off' to full brightness via a dc current source. Brightness is NOT proportional to forward voltage, however.
Steve